ftpc status and results summary of last data taken auau and dau calibration : data quality physic...
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![Page 1: FTPC status and results Summary of last data taken AuAu and dAu calibration : Data Quality Physic results with AuAu data –Spectra –Flow Physic results](https://reader036.vdocuments.net/reader036/viewer/2022062805/5697bfe21a28abf838cb4747/html5/thumbnails/1.jpg)
FTPC status and results
•Summary of last data taken
•AuAu and dAu calibration : Data Quality
•Physic results with AuAu data–Spectra
–Flow
•Physic results with dAu data–Centrality definition
–Strangeness
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Maria Mora Corral STAR Coll. Meeting, August03 2
Summary of RunIII
• FTPC successfully took ~20 106 dAu events and 8 106 pp events
Changes since last AuAu/pp (2001-2002) run
• Increased gain Better resolution
• Frisch grid grounding problem fixed Better residuals+
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Maria Mora Corral 3
Data quality
Vertex reconstruction with FTPC trackswith respect to TPC vertex :x,y ± 200 um AuAu datax,y ± 600 um dAu data
r ste
p [c
m]
hardware sector
uncorrectedcorrected
Inner cathode shift correction appliedand works with reasonable precision.
dAu data
AuAu data AuAu data
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Maria Mora Corral 4
Data quality II
Cross-check:
pT and dca for primaries in
different sectors ( regions)
Track parameters do not show any systematic effects.
FTPC ready for physics!
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Maria Mora Corral STAR Coll. Meeting, August03 5
AuAu Minbias pT spectra
Charged particlesAuAu minbias68k (47k)
No corrections
Quality Cuts:• dca < 2.0 cm
• 0.1 <= pT < 1.0 GeV/c
• 3.0 <= |y< 3.2
• Nhits >= 5
• |vertexz| <= 25 cm
1/N
even
t dN
/(p t
dp t
) [1
/GeV
2 ]
pt [GeV]
<pt>west=0.409+-0.0077 GeV<pt>east=0.394+-0.0078 GeV
FTPC West
FTPC East
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Maria Mora Corral STAR Coll. Meeting, August03 6
FTPC pion acceptance
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Maria Mora Corral STAR Coll. Meeting, August03 7
AuAu: <pT> vs centrality
centrality bin
<p t
> [G
eV/c
]
FTPC westFTPC east
<pT> calculated from power law fit in range pT [0.1,1.0] GeV/c
No corrections
Quality Cuts:• dca < 3.0 cm
• 0.1 <= pT < 1.0 GeV/c
• 2.8 <= |< 3.8
• Nhits >= 5
• |vertexz| <= 25 cm
• Charged hadrons <pT> increase slightly with centrality
• Same behaviour as for charged particles at central rapidity (TPC)
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Maria Mora Corral STAR Coll. Meeting, August03 8
AuAu: <pT> vs |
|Pseudo-rapidity|
<p t
> [G
eV/c
]
FTPC westFTPC east
Charged hadrons <pT> with |pseudorapidity|
• Charged hadrons <pT> decrease slightly with pseudo-rapidity
• Similar behaviour as seen by NA49 and BRAHMS
<pT> calculated from power law fit in range pT [0.1,1.0] GeV/c
No corrections
Quality Cuts:• dca < 3.0 cm
• 0.1 <= pT < 1.0 GeV/c
• 2.5 <= |< 3.5
• Nhits >= 5
• |vertexz| <= 25 cm
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Maria Mora Corral STAR Coll. Meeting, August03 9
AuAu: forward-backward correlation
String fusion model color strings = (small) areas in transverse space can overlap, forming clusters (percolation)
Overlapping of two color strings 3 independent regions can be distinguished :
• regions 1,2 no overlapping color field = color field of a single string • overlap region 3 with color field of both strings summed
Particle multiplicity is decreased while pT is enhanced
Forward/Backward correlations.
Projection of two overlapping strings ontothe transverse plane
One observable: Forward/Backward <pT> correlation [Eur. Phys. J. C 16, 349-359 (2000)]
Monte-Carlo model PSM 1.0 [Eur. Phys. J. C 22, 149-363 (2001)]
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Maria Mora Corral STAR Coll. Meeting, August03 10
AuAu: forward-backward pt correlation
< pT > = mean pT per eventForward; = [2.8,3.8]Backward; = [-3.8,-2.8]
FTPCs sensitive and a good tool to study long range forward/backward correlations
The min. bias data do not show strong correlation (preliminary)
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Maria Mora Corral STAR Coll. Meeting, August03 11
AuAu: Embedding
Thanks Eric!
Pt vs | efficiency
AuAu min. bias embedding
with pT flat [0., 2.0]
* 10% of TPC multiplicity
FTPC embedding has just taken off!!
within | = [2.8,3.8] efficiency
nicely constant ~ 80%
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Maria Mora Corral STAR Coll. Meeting, August03 12
AuAu: Flow, v2 cumulant method
V2 calculation with cumulant method with TPC+FTPC particles
v 2 (%
)
• Results unaffected by the missing sector (this method allows higher statistics).
• Cumulant method with 4 particles removes non-flow
effects in v2
•Non-flow effects seem to be ~ 1% in TPC rapidity• Non-flow effects do not affect FTPC region ?
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Maria Mora Corral 13
AuAu: v2 and FTPC
pT (GeV/c)
Cumulant method with 2 particles correlation can be used to determine v2 with
FTPC ALONE!! • v2 vs and
• v2 vs pT
Good agreement with FTPC+TPC!
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Maria Mora Corral 14
AuAu: v2 comparison
V2 vs from STAR in
comparison with PHOBOS data at 130 GeV and 200 GeV• STAR sqrt(s)=200
• PHOBOS sqrt(s)=130
• STAR sqrt(s)=200• PHOBOS sqrt(s)=200
FTPC is involved in other flow studies:
V1, V2 with event plane
method, Higher harmonics
(Markus O. Aihong T. and Art P. work)
See Art P.’s talk on Saturday
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Maria Mora Corral 15
dAu: FTPC defines centrality
Hijing simulation 50k dAu minbias
z-Vertex <= |60| cm
HIJING simulation shows a correlation between the impact parameter and the FTPC East multiplicity
FTPC data are used for STAR centrality definition
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Maria Mora Corral STAR Coll. Meeting, August03 16
dAu: Strangeness, s
p - (63.9%), m=1115.7 MeV, c=7.89 cm
* Study all pos-neg pairs, assuming p mass and mass (FTPC measures charge but no particle Id).
* Geometrical cuts for pairsDecay length > 10 cmPair dca < 2.5 mmProton-like dca [0.1, 2] cmPion-like dca > 1.5 cm
•Background estimation with rotated tracks:
•Every track is rotated 180o in and combined with all non-rotated tracks with opposite charge
•Same event characteristic, (mult, flow, vertex)
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Maria Mora Corral STAR Coll. Meeting, August03 17
dAu: and signal 5.8 M events dAu min bias in FTPC West only (better calibration)
yield = ~4000 Row Ratio = ~0.47 yield = ~1900Hijing ratio = 0.64 and with same cuts = 0.46
Real pairs
Background pairsReal pairs
Background pairs
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Maria Mora Corral STAR Coll. Meeting, August03 18
Summary
• AuAu, dAu, pp data with the FTPC available.
• Calibrations : AuAu complete, dAu near final, pp is being checked by Mirko P.
• First physics results on flow.
• Preliminary uncorrected charged particle spectra and andyields.
• Embedding is in progress for efficiency determination.
• FTPC available for data taking in Run IV.
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Maria Mora Corral STAR Coll. Meeting, August03 19
FTPC group
•Volker Eckardt
•María Mora Corral
•Markus Oldenburg
•Jörn Putschke
•Janet Seyboth
•Peter Seyboth
•Frank Simon
… and lots of help from STAR people, specially :
Eric, Jerôme, Lidia, Jeff …
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Maria Mora Corral STAR Coll. Meeting, August03 20
FTPC pion acceptance
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Maria Mora Corral STAR Coll. Meeting, August03 21
AuAu efficiency
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Maria Mora Corral STAR Coll. Meeting, August03 22
dAu efficiency|vertexz| < 20cm